Prevent incorrect error messages in UNION queries

Signed-off-by: Deven Bansod <[email protected]>

Author: devenbansod

src/Utils/Query.php

@@ -831,6 +831,8 @@ public static function getClauseStartOffset($statement, $list, $clause)
                     && ($clause === $token->value)
                 ) {
                     return $i;
+                } elseif ($token->value === 'UNION') {
+                    return -1;
                 }
             }
         }